Top 10 API Testing Tools Every Developer Should Know

As applications continue to solidify their interconnectivity, API testing is crucial to make sure that the teams are building and maintaining. Software is doing so in a way as to ensure that it’s functional, reliable and safe. 

With around 90% of developers using APIs in their projects, the right API testing software can help save time and make you more accurate. Excellent testing tools shorten test cycles so developers can maintain quality, and stay a step ahead of problems before they impact users. 

Let’s look at the top 10 API testing tools every developer should learn to streamline their workflow and produce better software.

1. Postman

One of the most popular API testing software tools is Postman due to its easy-to-use interface. It is a versatile choice for developers as it supports REST and SOAP APIs.

Key Features:

• It provides an option for automated and visual testing.

• It offers team-sharing collaboration features.

• Works with the CI/CD tools like Jenkins.

Postman is free to use and comes with a paid version for advanced features.

2. Katalon Studio

Katalon Studio is an API testing software tool. It has web, mobile, and API support so it’s an adequate tool for demanding testing needs.

Key Features:

• It offers low code and full code options.

• Supports data-driven testing.

• It can work with popular tools such as Jira and Jenkins.

Katalon Studio provides free and paid plans.

3. SoapUI

SoapUI is primarily designed to test APIs — especially SOAP and REST APIs. Its powerful features make it a favourite among QA testers.

Key Features:

• Supports data-driven testing.

• Ease of use with drag-and-drop interface.

• One of the major reasons is for integration with CI/CD pipelines.

SoapUI has a free and pro version and you get advanced features on the pro version.

4. JMeter

Originally developed for performance testing, JMeter is also used for API testing. It’s an open-source tool, making it a cost-effective choice.

Key Features:

• Compatible with CI/CD tools.

• Supports multiple protocols like HTTP and FTP.

• Includes a powerful report generator.

JMeter is free and highly customizable.

5. Rest-Assured

If you are into automated API testing with REST services, the Java-based online book RestAssured is the one that you should keep in your Stack. This is very useful for developers who know Java.

Key Features:

• This uses the Syntax of Given/When/Then.

• Supports all HTTP methods.

• Compatible with the Serenity automation framework.

Rest-Assured is open-source and free.

6. Apigee

Google product, Apigee is good for designing, testing, and monitoring API. If your API is enterprise-grade, it is suitable for API management.

Key Features:

• Allows real-time API monitoring.

• Supports multi-step transactions.

• Includes performance tracking.

Apigee provides paid or free according to the usage.

7. Assertible

Assertible is designed to work with automation and to fit into CI/CD workflows easily. It is meant to be used for reliable API testing with very little manual input.

Key Features:

• Supports automated testing after deployments.

• It is integrated with GitHub, Slack and Zapier.

• Provides prebuilt assertions for HTTP responses.

Assertible has free and paid plans starting at $25/month.

8. Tricentis Tosca

Tricentis Tosca is an API testing software solution that supports enterprise-level and offers advanced test automation features.

Key Features:

• It supports REST as well as SOAP APIs.

• It offers model-based test automation.

• It works perfectly with CI/CD tools.

Tosca is a paid tool with global enterprise support.

9. Swagger (OpenAPI)

Swagger is a framework for developing, documenting and testing your APIs. It enables developers to write API test automation and generate code.

Key Features:

• Provides API documentation.

• Supports auto-generation of client SDKs.

• It integrates with a lot of CI/CD tools.

Swagger is open source, with paid options for more features.

10. RapidAPI Testing

As a cloud-based platform for API testing, RapidAPI is perfect for teams seeking out scalable and team-centric testing solutions.

Key Features:

• It supports test automation in a CI/CD environment.

• It is for team collaboration on the API project.

• It offers analytics and real-time monitoring.

RapidAPI offers free and premium plans.

Conclusion

Selecting the right API testing software can lead to great development efficiency. Every tool on this list has unique features, so invest some time exploring them and finding what’s best for your project requirements. Postman and Rest Assured are the ideal tools for most of the developers, and if you are working with any Enterprise users Apigee or Tricentis Tosca would be good alternatives.

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